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\(ABCD\) is a quadrilateral with diagonal \(AC\) in which \(P\), \(Q\), \(R\) and \(S\) are mid-points of the sides \(AB\), \(BC\), \(CD\) and \(DA\). If \(AC\) is 15 \(cm\):
 
(i) The length of \(PQ\) \(=\)  \(cm\)
 
(ii) The sum of the lengths of \(SR\) and \(PQ\) \(=\)  \(cm\)
 
[Note: Insert decimal point if necessary.]